centcomm sss beacon update (#24)

## About the PR
Adds station map beacons to centcomm.
Removes the generators in gravgen and gives the grid infinite power.
Removed some player spawnpoints & added a few random item spawns to make
certain areas have meatier loot.

this pr is untested in actual gameplay, but the map initializes fine.

## Why / Balance
map beacons good
power was basically intended to be infinite anyways but it just used
debug generators for some reason
player spawns are intended to compact people more. hopefully it has Some
Effect but we will see.

## Technical details
<!-- Summary of code changes for easier review. -->

## Media
<!-- Attach media if the PR makes ingame changes (clothing, items,
features, etc).
Small fixes/refactors are exempt. Media may be used in SS14 progress
reports with credit. -->

## Requirements
<!-- Confirm the following by placing an X in the brackets [X]: -->
- [X] I have read and am following the [Pull Request and Changelog
Guidelines](https://docs.spacestation14.com/en/general-development/codebase-info/pull-request-guidelines.html).
- [X] I have added media to this PR or it does not require an ingame
showcase.
<!-- You should understand that not following the above may get your PR
closed at maintainer’s discretion -->

## Breaking changes
<!-- List any breaking changes, including namespaces, public
class/method/field changes, prototype renames; and provide instructions
for fixing them.
This will be posted in #codebase-changes. -->

**Changelog**
:cl:
- add: Added station beacons to Centcomm.

Resources/Locale/en-US/_SSS/station-beacons.ftl

@@ -0,0 +1,12 @@
+station-beacon-deathsquad-armory = Deathsquad Armory
+station-beacon-ert-armory = ERT Armory
+station-beacon-commander = Commander's Quarters
+station-beacon-commander-vault = Commander's Vault
+station-beacon-central-surveillance-area = Central Surveillance Area
+station-beacon-ert-meeting-room = ERT Meeting Room
+station-beacon-ert-dock = ERT Docking Area
+station-beacon-arrivals-security-checkpoint = Arrivals Security Checkpoint
+station-beacon-arivals-waiting-area = Arrivals Waiting Area
+station-beacon-civilian-area-checkpoint = Civilian Area Checkpoint
+station-beacon-civilian-dock = Civilian Docking Area
+station-beacon-fuel-room = Fuel Rooom